The Optimal Allocation Of Deep-geothermal Water Resources For Zhengzhou

There was a great contribution of the development and utilization of geothermal water in the Zhengzhou City to the economic and social development and the improvement of living standards. Leading to the over-exploitation of the geothermal water resources, and the geothermal water level continued to drop and expanding cone of depression, due to lack of scientific, rational, unified development and utilization of geothermal water. At the same time, it inhibit the economic benefits of geothermal resources in original cost because unreasonable distribution of water between different trades. Therefore, there is a great significance of carrying out the research of science and optimal allocation of geothermal water resources in Zhengzhou City in order to make rational use of geothermal resources.Based on the geological conditions of the urban area in Zhengzhou, in the systematic analysis of the Zhengzhou urban area of geothermal reservoir characteristics, the development and utilization of geothermal water status in Zhengzhou was evaluated.The demand water of various sectors and administrative districts in the next few years had been predicted with Gray model. Fuzzy multi-objective linear programming method is applied to built deep geothermal mathematical model in Zhengzhou for optimal allocation of water resources. The utilization and optimal allocation program of geothermal water resources in Zhengzhou urban area has been developed.The geothermal wells in Zhengzhou urban had been planned layout, development and utilization of partition scheme was proposed, the theoretical basis of the rational exploitation and utilization of geothermal water is provided.The conclusions of the study include:(1) In Zhengzhou urban sedimentary basins ,heat storage temperature increases with depth increasing, Temperature gradient is greater than 3℃/100m area were banded structure in the southwest,urbaneast, north-east of urban.(2) In Zhengzhou urban, water chemical types are mainly HCO3-Na type, part of the HCO3-Na ? Ca ? Mg type, with the depth, the degree of mineralization increases.(3) Depth of less than 800m for the thermal reservoir and the depth is greater than 800m of the heat reservoir, the extent of their exploitation are evaluated, and accordingly developed a geothermal water resources development planning.(4) For the status of geothermal water resources are unreasonable exploitation in Zhengzhou urban, it's carry out geothermal optimal allocation of water resources with the Fuzzy multi-objective model .the result is that the exploitation of geothermal water resources in Zhengzhou in total quantity should be controlled at 7.2193 million m3 by 2010, and 8.8652 million m3 by 2015, is expected to achieve the economic benefits of 37.8706 million yuan by 2010, about 45.356 million yuan by 2015.